.a_bk {
		width: 100%;
		height: 100%;
		position: fixed;
		/* background-image: url(../assets/img/9.jpg); */
		background-color: rgba(50, 81, 90, 0.712);
		background-size: cover;
		background-attachment: fixed;
		
	}
	.title {
		text-align: center;
	

		animation-delay: 0.5s;
		margin-top:50px;
		font-weight: 300;
		color: #fff;
		font-size: 35px;
	}
	.box3 {
		display: flex;
		justify-content: center;
		transition: 0.5s;
		font-size: 20px;
		font-weight: 500;
		text-align: center;
	}
	.box4 {
		background-color: #00000060;
		border: 0;
		color: #FFFFFF;
	}
	.box3 h4{
		font-weight: 500;
		font-size: 25px;
	}
	.box3:hover {
		background-color: #00000060;
		color: white;
		border-color: #000000;
	}
	.number {
		position: absolute;
		width: 100px;
		margin-top: 100px;
		font-size: 100px;
		font-weight: 400;
		z-index: 1;
		color: transparent;
		text-align: center;
		-webkit-text-stroke: 1px #ccc;
		opacity: .5;
	}
	.icon {
		height: 50px;
		width: 50px;
	}
	.box {
		display: flex;
		justify-content: center;
		align-items: center;
	}
	.box2 {
		display: flex;
		justify-content: center;
		flex-direction: column;
	}
	.activityCard{
		margin-bottom: 50px;
		 /* height: 500px; */
		 background-color: #00010160;
		 border: #000000;
		 color: #FFFFFF;
		 font-size: 20px;
		 font-weight: 400;
		 /* width: 350px; */
		 /* min-width: 33.3%; // 加入这两个后每个item的宽度就生效了 */
		     /* max-width: 33.3%; */
			 flex: 1;
			 margin-right: 0;
			 
		 /* height: 800px; */
	}
	
	.activityCard span{
		font-size: 20px;
		font-weight: 200;
	}